645268823 has 8 divisors (see below), whose sum is σ = 679536000. Its totient is φ = 611032248.

The previous prime is 645268777. The next prime is 645268829. The reversal of 645268823 is 328862546.

645268823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-645268823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645268829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44990 + ... + 57572.

It is an arithmetic number, because the mean of its divisors is an integer number (84942000).

Almost surely, 2^645268823 is an apocalyptic number.

645268823 is a deficient number, since it is larger than the sum of its proper divisors (34267177).

645268823 is a wasteful number, since it uses less digits than its factorization.

645268823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15301.

The product of its digits is 552960, while the sum is 44.

The square root of 645268823 is about 25402.1420947132. The cubic root of 645268823 is about 864.1322773976.

The spelling of 645268823 in words is "six hundred forty-five million, two hundred sixty-eight thousand, eight hundred twenty-three".